Simple way of teaching transistor amplifiers

For small signal analysis a simple change from commonly used tranconductance gm to transresistance rm=1/gm leads to a significant simplification of all equations. Moreover these equations are much easier to memorize since they have a form of resistor ratio for CE (CS) and CB (CG) configurations and the form or resistor divider for CC (CD) configuration. With presented approach most of students are able to read diagrams and to understand the effect of each element change on the circuit performance. Students are not lost with messy equations, but they are in control of their design and they know which parameters they have to change in order to change behavioral characteristics.